| abstract |
The invention discloses a synthesis method of 2,3,6-trichlorobenzoic acid and its intermediate. The invention provides a preparation method of 2,3,6-trichlorotoluene, which comprises the following steps: in the presence of a catalyst, the mixture of dichlorotoluene is chlorinated with a chlorination reagent to obtain 2,3,6- Trichlorotoluene is sufficient, the catalyst is a metal and/or metal halide, and the mixture of dichlorotoluene is a mixture of 2,6-dichlorotoluene and 2,3-dichlorotoluene or 2,6- A mixture of dichlorotoluene, 2,3-dichlorotoluene and 2,5-dichlorotoluene. The synthesis method of the invention has high reaction yield, high selectivity, high purity of the prepared product, low production cost, simple operation, mild reaction conditions and is suitable for industrialized production. |